Polymer conversion

ABSTRACT

NEW COPOLYMERS OF BUTADIENE AND EITHER STYRENE OR A STYRENE-TYPE MONOMER ARE FORMED IN WHICH ALL OF THE STYRENE OR STYRENE-TYPE UNITS ARE RELATIVELY UNIFORMLY DISTRIBUTED IN BUTADIENE AT ONE OR BOTH ENDS OF THE MOLECULE, AND THE BALANCE OF THE MOLECULE IS COMPOSED OF BUTADIENE. THE TREADS MADE FROM THE COPOLYMERS EXHIBIT BETTER WEAR RESISTANCE THAN OTHER BUFADIENE-STYRENE COPOLYMERS

DEFENSIVE FUNCTION UNITED STATES PATENT OFFICE Published at the requestof the applicant or owner in accordance with the Notice of Dec. 16,1969, 869 0.G. 687. The abstracts of Defensive Publication applicationsare identified by distinctly numbered series and are arrangedchronologically. The heading of each abstract indicates the number ofpages of specification, including claims and sheets of drawingscontained in the application as originally filed. The files of theseapplications are available to the public for inspection and reproductionmay be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Ofiice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED DECEMBER 14-, 1971 T893,004 BLOCK (IOPOLYMERS OF BUTADIENE ANDSTYJRENE William Glenn Mayes, Akron, Ohio, assignor to The FirestoneTire 8: Rubber Company, Akron, Ohio Continuation of application Ser. No.658,550, Aug. 4, 1967. This application Oct. 12, 1970, Ser. No. 80,249Int. Cl. (308E 15/04 US. Cl. 260-880 B 2 Sheets Drawing. 14 PagesSpecification New copolymers of butadiene and either styrene or astyrene-type monomer are formed in Which all of the styrene orstyrene-type units are relatively uniformly distributed in butadiene atone or both ends of the mole cule, and the balance of the molecule iscomposed of butadiene. Tire treads made from the copolymers exhibitbetter wear resistance than other butadiene-styrene copolymers.

W. G. MAYES Dec. 14, 197B BLOCK COPOLYMERS OF BUTADIENE AND S'IYRENE 2Sheets-Sheet. 1

Filed Oct. 12, 1970

